Pillow sleeve



FIG. 1 is a perspective view of a pillow sleeve, showing my new design within an environment of use;

FIG. 2 is a perspective view of a pillow sleeve;

FIG. 3 is a top plan view thereof, with the bottom plan view being identical thereto; and,

FIG. 4 is a front elevation view thereof, with the rear elevation being identical thereto.

In FIG. 1, the broken lines depict environmental subject matter that forms no part of the claimed design. 

CLAIM The ornamental design for a pillow sleeve, as shown and described. 